Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is fully covered by structured data. The description adds one useful behavioral fact – that results are limited to divisions with playable channels – but says nothing about ordering, completeness, or whether the country filter changes the result shape.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single short sentence with the scoping qualifier front-loaded; nothing is padded. It is efficient, though it is arguably too terse to carry usage or parameter context.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple zero-required-parameter list tool with rich annotations and no output schema, the description is adequate. It omits any mention of the optional country narrowing and does not say what a division entry contains, which are the main remaining gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

There is a single optional parameter (country) and schema description coverage is 100%, including the ISO 3166-1 alpha-2 format note. The description does not mention the filter at all, so by the high-coverage baseline this sits at 3.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource (states and provinces) and a scoping qualifier (those with a playable channel), which lets an agent distinguish it from list_countries and list_cities reasonably well. It has no explicit verb, but 'list' is implied by the name and the enumerative framing.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this instead of list_countries, list_cities, or geo. The only hint is the 'playable channel' qualifier, which implies a filtered subset but does not say when that subset is the right lookup versus a sibling list tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.